A primary color of the spectrum that, when added to blue, forms purple, and when added to yellow, forms orange.
An odorless red-brown powder used in testing for amyloid. In polarized light, amyloid treated with Congo red produces a green fluorescence.
An indicator of pH. It is yellow below pH 7.4 and red above 9.0.
An indicator of pH. It is red at pH 4.4 and yellow at 6.2.
CAS # 493-52-7
A red azo dye used to stimulate healing of indolent ulcers, burns, wounds, and so on; in histology, used as a stain.
SYN: SEE: rubrum scarlatinum
A stain used in preparing tissues for microscopic examination.
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